With the development of market economy, the planting area of ​​mung bean has been expanding year by year, and the disease of mung bean has gradually increased. The following are the main diseases and prevention and control of mung bean. I. Viral Disease (I) Symptoms The disease is very common and occurs at the seedling stage. The main manifestations in the field are mottled leaves and wrinkled mosaics. When the disease is light, plants with mosaic and mottled symptoms appear at the seedling stage. When the disease is heavy, the seedlings appear wrinkled and narrow leaf-planted mosaic plants. The leaves are deformed, shrunk, the mesophyll uplift, and the formation of ecchymosis. There are obvious yellow-green and white wrinkled mosaics. (b) Incidence conditions 1. Seed diseased seeds are sown that cause direct disease. 2. Mungbean fields have a large number of locusts and the incidence is heavy. 3. The stormy weather caused inter-plant friction and increased infection. (C) Control methods 1. Select disease-free or disease-resistant varieties with timely use of 40% omethoate 1000 times, spray control aphids. 2. At the beginning of the disease, 20% of viral warts or 20% of A500 times of virus should be sprayed and sprayed at intervals of 7 to 10 days, usually 2 to 3 times. Second, leaf spot disease (a) symptoms of mung bean disease, the initial appearance of water spots in the leaves on the small spots, then expanded to a round or irregular brown spots, and later become large necrotic spots, causing dry or fallen leaves. (B) the incidence of the disease The incidence of the disease is closely related to temperature and humidity. At a relative humidity of 85% to 90%, the conidial germination of the pathogenic bacteria was fastest when the temperature was between 25 and 28°C. When the temperature reached 32°C, the mycelia grew most vigorously and the disease developed fastest. In our city, it is usually the mung bean flowering period and high temperature after the rain. (c) Prevention and control methods 1. Select disease-resistant varieties, make them dense and dense, and ensure good ventilation in the field. 2. Strengthen field management and pay attention to fishing or scatter after heavy rain. 3. In the early stage of disease, 70% mancozeb 500 times liquid is used, or 41% special effect sterilization king 2000 times liquid, 20% Randy 500 times spray control. Spray every 7 to 10 days, even spray 2 or 3 times, can effectively control the disease epidemic. Third, root rot (a) symptoms of the early onset of heart yellow leaves, if you pull out the root observation, we can see the lower part of the stem and the main root was dark brown, slightly concave. Looking at the stem, the vascular bundle turns dark brown. When most of the roots are rotted, the plants wither and die. (II) Control methods 1. Select disease-resistant varieties and implement non-legume crop rotation for more than 3 years. 2. Time cultivating, drainage after rain, increase the temperature. 3. In the early stage of disease, 75% chlorothalonil 600 times solution, or 15% rotten spirit 600 times solution, 70% thiophanate-methyl 1000 times solution was sprayed, sprayed once every 7-10 days, and sprayed 2 or 3 times. Such as using the above agents better irrigation.
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